Answer
(a) See graph
(b) Increasing on $(-0.31,0)\cup(0.31,\infty)$,
decreasing on $(-\infty,-0.31)\cup(0,0.31)$
(c) The function is even.
Work Step by Step
(a) The graph of the function $f(x)=2x^6+5x^4-x^2$ is as shown.
(b) From the graph, the function is increasing in the interval $(-0.31,0)\cup(0.31,\infty)$, decreasing in the interval $(-\infty,-0.31)\cup(0,0.31)$, but no constant.
(c) Since the graph is symmetrical about the $y$-axis, the function is even.
